<template>
    <div>
         <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>商品分类</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <el-row>
                <el-col>
                <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
                </el-col>
            </el-row>
            <!-- 表格 -->
            <tree-table
                class="treeTable"
                :data="cateList"
                :columns="columns"
                :selection-type="false"
                :expand-type="false"
                index-text="#"
                :show-row-hover="false"
                empty-text="拼命加载中..."
                show-index
                border
                >
                <!-- 是否有效 -->
                <template slot="isOk" slot-scope="scope">
                <i
                    class="el-icon-success"
                    style="color: lightgreen"
                    v-if="scope.row.cat_deleted === false"
                ></i>
                </template>
                <!-- 排序 -->
                <template slot="order" slot-scope="scope">
                <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
                <el-tag size="mini" type="success" v-else-if="scope.row.cat_level === 1">二级</el-tag>
                <el-tag size="mini" type="warning" v-else>三级</el-tag>
                </template>
                <!-- 操作 -->
                <template slot="opt" slot-scope="scope">
                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditCateDialog(scope.row.cat_id, scope.row.cat_name)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeCate(scope.row.cat_id, scope.row.cat_name)">删除</el-button>
                </template>
            </tree-table>
            <!-- 分页 -->
            <el-pagination
                @size-change="handleSizeChange"
                @current-change="handleCurrentChange"
                :current-page="queryInfo.pagenum"
                :page-sizes="[3, 5, 10, 15]"
                :page-size="queryInfo.pagesize"
                layout="total, sizes, prev, pager, next, jumper"
                :total="total"
                background
                prev-text="上一页"
                next-text="下一页"
            ></el-pagination>
        </el-card>
         <!-- 添加分类的对话框 -->
        <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed">
            <el-form
                :model="addCateForm"
                :rules="addCateFormRules"
                ref="addCateFormRef"
                label-width="100px"
            >
                <el-form-item label="分类名称：" prop="cat_name">
                <el-input v-model="addCateForm.cat_name"></el-input>
                </el-form-item>
                <el-form-item label="父级分类：">
                <!-- options：数据源 -->
                <!-- props：指定配置对象 -->
                <el-cascader
                    v-model="selectedKeys"
                    :options="parentCateList"
                    :props="cascaderProps"
                    @change="parentCateChanged"
                    clearable
                    filterable
                    style="width: 100%"
                ></el-cascader>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addCateDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addCate">确 定</el-button>
            </span>
        </el-dialog>
      
        <!-- 编辑分类的对话框 -->
        <el-dialog title="编辑分类" :visible.sync="editCateDialogVisible" width="50%">
            <el-form
                :model="editCateForm"
                :rules="editCateFormRules"
                ref="editCateFormRef"
                label-width="100px"
            >
                <el-form-item label="分类名称：" prop="cat_name">
                <el-input v-model="editCateForm.cat_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editCateDialogVisible=false">取 消</el-button>
                <el-button type="primary" @click="eidtCate">确 定</el-button>
            </span>
        </el-dialog>

    </div>
</template>

<script>
import Qs from "qs"


export default {
    data(){
        return {
            // 商品分类数据
            cateList: [],
            // 查询条件
            queryInfo: {
                type: 3,
                pagenum: 1,
                pagesize: 5
            },
            total: 0,
            // 为table指定列的定义
            columns: [
                {
                label: '分类名称',
                prop: 'cat_name',
                // align: "center",
                // headerAlign: "center",
                },
                {
                label: '是否有效',
                // 当前列 自定义模板
                type: 'template',
                template: 'isOk',
                // align: "center",
                // headerAlign: "center",
                },
                {
                label: '排序',
                // 当前列 自定义模板
                type: 'template',
                template: 'order',
                // align: "center",
                // headerAlign: "center",
                },
                {
                label: '操作',
                // 当前列 自定义模板
                type: 'template',
                template: 'opt',
                // align: "center",
                // headerAlign: "center",
                }
            ],
            // 添加分类
            addCateDialogVisible: false,
             // 选中的父级Id数组
            selectedKeys: [],
            // 添加分类对象
            addCateForm: {
                // 将要添加分类名称
                cat_name: '',
                // 分类父级id
                cat_pid: 0,
                // 分类等级：`0`表示一级分类；`1`表示二级分类；`2`表示三级分类
                cat_level: 0
            },
            // 添加分类表单的验证规则
            addCateFormRules: {
                cat_name: [
                { required: true, message: '请输入分类名称', trigger: 'blur' }
                ]
            },
            // 父级分类列表
            parentCateList: [],
            // 指定级联选择器的配置对象
            cascaderProps: {
                // 配置触发选项 hover/click
                expandTrigger: 'hover',
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
                checkStrictly: true,
            },
            // 编辑对话框 控制
            editCateDialogVisible: false,
            // 编辑分类表单验证
            editCateFormRules: {
                cat_name: [
                { required: true, message: '请输入分类名称', trigger: 'blur' }
                ]
            },
            // 编辑表单 绑定对象
            editCateForm: ''
        }
    },
    created(){
        this.getCateList();
    },
    methods:{
        // 获取商品分类
        async getCateList () {
            const { data: res, status: status} = await this.axios.get('categories', {
                params: this.queryInfo
            })
            if (status !== 200) {
                return this.$message.error('获取商品分类失败！')
            }
            // 给数据列表赋值
            this.cateList = res.data
            // 总数据条数
            this.total = res.total
        },
        // 监听 pageSizeChange
        handleSizeChange (newSize) {
            this.queryInfo.pagesize = newSize
            this.getCateList()
        },
        // 监听 pagenum改变
        handleCurrentChange (newPage) {
            this.queryInfo.pagenum = newPage
            this.getCateList()
        },
         // 添加操作
        showAddCateDialog () {
            // 先获取父级分类数据
            this.getParentCateList()
            // 再打开对话框
            this.addCateDialogVisible = true
        },
        // 获取父级分类的数据
        async getParentCateList () {
            const { data: res, status: status } = await this.axios.get('categories', {
                params: { type: 2 }
            })
            if (status !== 200) {
                return this.$message.error('获取父级分类失败！')
            }
            this.parentCateList = res.data
        },
        // 添加分类 选择项发生变化触发
        parentCateChanged () {
            // 如何selectKeys 数组的长度>0 说明选中父级分类

            if (this.selectedKeys.length > 0) {
                // 父级分类的Id
                this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
                // 当前分类的等级
                this.addCateForm.cat_level = this.selectedKeys.length
                return
            } else {
                // 父级分类的Id
                this.addCateForm.cat_pid = 0
                // 当前分类的等级
                this.addCateForm.cat_level = 0
            }
        },
        // 添加分类
        addCate () {
            this.$refs.addCateFormRef.validate(async valid => {
                if (!valid) return
                const { data: res, status: status } = await this.axios.post('categories', this.addCateForm)
                if (status !== 200) {
                return this.$message.error('添加分类失败！')
                }
                this.$message.success('添加分类成功！')
                this.getCateList()
                this.addCateDialogVisible = false
            })
        },
        // 添加分类 重置表单
        addCateDialogClosed () {
            this.$refs.addCateFormRef.resetFields()
            this.selectedKeys = []
            this.addCateForm.cat_level = 0
            this.addCateForm.cat_pid = 0
        },
        // 删除分类
        async removeCate (id, name) {
            const confirmResult = await this.$confirm(name + ' 此操作将永久删除该分类, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)
            if (confirmResult !== 'confirm') { return this.$message.info('已取消删除！') }
            const { data: res, status: status } = await this.axios.delete('categories/' + id)
            if (status !== 200) { return this.$message.error('删除商品分类失败！') }
            this.$message.success('删除商品分类成功！')
            this.getCateList()
        },
        // 显示编辑对话框
        async showEditCateDialog (id, name) {
            // const { data: res, status: status } = await this.axios.get('categories/' + id)
            // if (status !== 200) return this.$message.error('获取分类失败！')
            // this.editCateForm = res.data
            this.editCateForm = {'cat_id': id, 'cat_name': name}
            this.editCateDialogVisible = true
        },
        // 编辑分类名
        eidtCate () {
            this.$refs.editCateFormRef.validate(async valid => {
                if (!valid) return
                const { data: res, status: status } = await this.axios.put('categories/' + this.editCateForm.cat_id,
                {
                    cat_name: this.editCateForm.cat_name
                })
                if (status !== 200) return this.$message.error('更新分类名失败！')
                this.$message.success('更新分类名成功！')
                this.getCateList()
                this.editCateDialogVisible = false
            })
        }
    },
}
</script>

<style lang="less" scoped>
.treeTable {
  margin-top: 20px;
}
</style>